ASU 220 All Soviet Union MO 1976 50 exact watches in a table
Source:
July 5, 2019
distancecombinatoricscombinatorial geometry
Problem Statement
There are exact watches lying on a table. Prove that there exist a certain moment, when the sum of the distances from the centre of the table to the ends of the minute hands is more than the sum of the distances from the centre of the table to the centres of the watches.